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Śrīmad-Bhāgavatam
[Canto 8, Ch. 3]
confirmed in the śruti-mantra,  yato vā imāni bhūtāni jāyante. yena jātāni jīvanti. yat prayanty abhisaṁviśanti.  The original cause of everything is the Supreme Personality of Godhead, and after being annihilated, everything enters into Him ( prakṛtiṁ yānti māmikām ). Thus the Supreme Lord, the Personality of Godhead—Lord Rāmacandra or Lord Kṛṣṇa—is the original cause of everything.
īśvaraḥ paramaḥ kṛṣṇaḥ sac-cid-ānanda-vigrahaḥ anādir ādir govindaḥ sarva-kāraṇa-kāraṇam
“Kṛṣṇa, who is known as Govinda, is the supreme controller. He has an eternal, blissful, spiritual body. He is the origin of all. He has no other origin, for He is the prime cause of all causes.” ( Brahma-saṁhitā  5.1) The Lord is the cause for everything, but there is no cause for Him.  Sarvaṁ khalv idaṁ brahma. Mat-sthāni sarva-bhūtāni na cāhaṁ teṣv avasthitaḥ.  Although He is everything, His personality is different from the cosmic manifestation.
TEXT 4
यः स्वात्मनीदं निजमाययार्पितं क्वचिद् विभातं क्व च तत् तिरोहितम् । अविद्धृक् साक्ष्युभयं तदीक्षते स अत्ममूलोऽवतु मां परात्परः ॥ ४ ॥
yaḥ svātmanīdaṁ nija-māyayārpitaṁ kvacid vibhātaṁ kva ca tat tirohitam aviddha-dṛk sākṣy ubhayaṁ tad īkṣate sa ātma-mūlo 'vatu māṁ parāt-paraḥ
yaḥ —the Supreme Personality of Godhead who;  sva-ātmani —in Him;  idam —this cosmic manifestation;  nija-māyayā —by His own potency;  arpitam —invested;  kvacit —sometimes, at the beginning of a  kalpa ;  vibhātam —it is manifested;  kva ca —sometimes, during dissolu-